Vania



(No Model.)

W. STANLEY, Jr.

REGULATING SELF EXCITING ALTERNATE CURRENT ELECTRIC GENERATORS.

No. 404,120. Patented May 28, 89.

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UNITED STATES PATENT OFFICE.

IVILI'JIAM STANLEY, JR, OF GREAT BARRINGTON, MASSACHUSETTS, ASSIGNOR TO THE \VESTINGHOUSE ELECTRIC COMPANY, OF PIT SBURG, PENNSYL- VANIA.

REGULATING SELF-EXCITING ALTERNATE-CURRENT ELECTRIC GENERATORS.

SPECIFICATION forming part of Letters Patent No. 404,120, dated May 28, 1889.

Application filed September 1, 1887. Serial No. 248,487. (No model.)

To all whom it may concern: ture, a, and a field-magnet, b. The field-mag- Be it known that I, lVILLIAM STANLEY, J r., net coils Z) are designed to be supplied with a citizen of the United States, residing at rectified currents derived, in a manner to be Great Barrington, in the county of Berkshire described, from the conductors L and L 5 and State of Massachusetts, have invented which respectively lead from the brushes a certain new and useful Improvements in 0 applied to the collector E. The collector Regulating Self-Exciting Alternate-Current E consists of two rings, respectively connected Electric Generators, of which the following is with the terminals of the armaturecoils in a a specification. manner well understood.

to The invention relates to an organization of The lines L L supply converters 0' C apparatus for producing alternating electric which have in this instance their secondary 6o currents of an approximately constant differcoils s .9 connected through translating deence of potential. vices (Z d, while the primary coils are con- The object of the invention is to provide nected in multiple are between the lines L r 5 means for causing an alternate-current elec- L The organization of the work-circuit,

tric generator to be excited by currents dehowever, may be variously modified. rived from its armature, and to cause the Between the lines L L there is connected field-magnet strength to be varied in accordthe primary coil p of a converter, 0. The secance with the variations in the current conondary coil 5 of thisconverter has its respect- 2c sumed in the work-circuit, so that an approxiive terminals connected by conductors 7 and mately constant difference of potential may 8 with the contact-brushes (Z (Z of a rectifybe maintained between the terminals of the ing-commutator, D. This commutator may generatorbe carried upon the shaft of the generator A.

In general terms, the invention may be said The other brushes, (1 and d, of this commu- 25 to consist in supplying the field-magnet coils tator are connected by conductors 3 and 4:

with a rectified current derived from the secwith the respective terminals of the field-magondary coil of an electric converter, the prinet coils l) of the generator, and therefore mary of which is included in a shunt around rectified currents will be delivered to these the work-circuit or across from one terminal coils.

30 to the other of the generator. One coil of a For the purpose of rendering the strength dilterentially-wound inductive resistance is of the rectified current which is delivered to included in series with the primary coil of the field-magnet coils dependent upon the the converter, while the other coil of this revariations in the work being done an inductsistance is included in series with the workive resistance, R, is employed. This consists 35 circuit. The variations in resistance or counof a soft-iron core wound with two coils, 0" 0' ter electro-motive force developed by reason which oppose each other. The coil 0'' is conof this inductive resistance governs the curnected in series with the coil p of the conre-it through the primary of the converter, verter C, while the coil 0' is connected in the at d thus regulates the current delivered to line L leading to the work-circuit, and thus 0 the field-magnet coils. in series with the devices to beoperated.

In an application filed October 18, 1888, Now it is evident that in order to maintain a Serial N 288,444), the method herein shown constant difference of potential between the is claimed. terminals of the armature the field-excite- In the accompanying drawingthere is shown, mcnt must be increased when the diiterence 45 partly in diagram, an organization of circuits of potential between the terminals of the arand apparatus adapted to carry out the in mature falls off or decreases, and vice versa. vention. It is also evident that the difference of poten- Rei'erring to the figure, A represents an altial between the brushes a and (t will tend ternate-current generator having an armato be lower when a considerable current is flowing through the main line than when little current is flowing. The fluctuations or variations of current flowing through the main line are employed for vautomatically varying the counter electro-motive force developed in the resistance R, thereby varying the electro-motive force applied to the converter C, and thus in turn varying the electro-motive force applied to the field-magnet coils. It, now, equal currents flow through the coils r and r no counter electro-motive force will be developed in the resistance R; but as the work being done is diminished less current will flow through the coil W, and thus more counter electro-motive force will be developed in the coil 1", thus diminishing the current which will flow through the coil 19 of the converter O. This in turn diminishes the current delivered. to the field-magnet coils. It, now, more current is required in the work-circuit, the inductive resistance or counter electromotive force in the coil '1' will be diminished, allowing more current to pass through the coil 1) of the converter 0.

The ratio between the converter 0 and the inductive resistance B may be varied in any manner desired, so that the required current for supplying the field-magnets may be obtained, and the coil sof the converter 0 may be constructed with reference to the coil 1), so as to reduce or increase the difference of potential at the terminal of the field-magnet coils as required. It may be desirable in some instances to construct the coil 1* so that its active length may be varied to accommodate the apparatus to the particular requirements of a system. This may be accomplished by means of a switch, S, connected with a conductor, 5, and applied to switchpoints 8', s and 8 connected with diiterent points in the length of the coil 7''.

I claim as my invention 1. The combination, with an electric generator supplying alternate currents, of a converter having its primary coil connected across the terminals of the armature of the generator, a rectifying-commutator through which the currents from the secondary coil of the converter are delivered to the fieldnected with the terminals of the secondary coil of the converter, and conductors connecting the rectifying-commutator with the fieldmagnet coils of the generator.

3. The combination, with an alternate-current electric generator, of an inductive resistance wound with opposing coils, one coil being connected in series with the work-circuit of the generator and the other in multiple arc with the work-circuit, a converter having its primary coil in series with the last-named coil, a rectifying-commutator connected with the terminals of the secondary coil of the converter, conductors connecting the rectifyingcommutator with the field-magnet coils of the generator, and means for varying the relative lengths of the coils of the inductive resistance.

4. The combination, with an alternate-eurrent electric machine, of a conductor connected across the poles of the same through which currents are supplied to the field-magnet coils, an inductive resistance included in said conductor, and a coil connected in the main circuit for varying the value of the inductive resistance in inverse proportion to the current consumed in the work-circuit.

In testimony whereof I have hereunto subscribed my name this 19th day of August, A. D. 1887. I

WILLIAM STANLEY, JR.

Witnesses:

CHARLES A. TERRY, J osnrn B. BRAMAN. 

